7 files changed, 37 insertions, 28 deletions

diff --git a/src/video_core/host_shaders/CMakeLists.txt b/src/video_core/host_shaders/CMakeLists.txt
index cd2549232..969f21d50 100644
--- a/src/video_core/host_shaders/CMakeLists.txt
+++ b/src/video_core/host_shaders/CMakeLists.txt
@@ -9,7 +9,7 @@ set(FIDELITYFX_FILES
 )
 
 set(GLSL_INCLUDES
-    fidelityfx_fsr.comp
+    fidelityfx_fsr.frag
     ${FIDELITYFX_FILES}
 )
 
@@ -56,10 +56,11 @@ set(SHADER_FILES
     vulkan_color_clear.frag
     vulkan_color_clear.vert
     vulkan_depthstencil_clear.frag
-    vulkan_fidelityfx_fsr_easu_fp16.comp
-    vulkan_fidelityfx_fsr_easu_fp32.comp
-    vulkan_fidelityfx_fsr_rcas_fp16.comp
-    vulkan_fidelityfx_fsr_rcas_fp32.comp
+    vulkan_fidelityfx_fsr.vert
+    vulkan_fidelityfx_fsr_easu_fp16.frag
+    vulkan_fidelityfx_fsr_easu_fp32.frag
+    vulkan_fidelityfx_fsr_rcas_fp16.frag
+    vulkan_fidelityfx_fsr_rcas_fp32.frag
     vulkan_present.frag
     vulkan_present.vert
     vulkan_present_scaleforce_fp16.frag
diff --git a/src/video_core/host_shaders/fidelityfx_fsr.comp b/src/video_core/host_shaders/fidelityfx_fsr.frag
index f91b1aa9f..a266e1c4e 100644
--- a/src/video_core/host_shaders/fidelityfx_fsr.comp
+++ b/src/video_core/host_shaders/fidelityfx_fsr.frag
@@ -34,7 +34,6 @@ layout( push_constant ) uniform constants {
 };
 
 layout(set=0,binding=0) uniform sampler2D InputTexture;
-layout(set=0,binding=1,rgba16f) uniform image2D OutputTexture;
 
 #define A_GPU 1
 #define A_GLSL 1
@@ -72,44 +71,40 @@ layout(set=0,binding=1,rgba16f) uniform image2D OutputTexture;
 
 #include "ffx_fsr1.h"
 
-void CurrFilter(AU2 pos) {
-#if USE_BILINEAR
-    AF2 pp = (AF2(pos) * AF2_AU2(Const0.xy) + AF2_AU2(Const0.zw)) * AF2_AU2(Const1.xy) + AF2(0.5, -0.5) * AF2_AU2(Const1.zw);
-    imageStore(OutputTexture, ASU2(pos), textureLod(InputTexture, pp, 0.0));
+#if USE_RCAS
+    layout(location = 0) in vec2 frag_texcoord;
 #endif
+layout (location = 0) out vec4 frag_color;
+
+void CurrFilter(AU2 pos) {
 #if USE_EASU
     #ifndef YUZU_USE_FP16
         AF3 c;
         FsrEasuF(c, pos, Const0, Const1, Const2, Const3);
-        imageStore(OutputTexture, ASU2(pos), AF4(c, 1));
+        frag_color = AF4(c, 1.0);
     #else
         AH3 c;
         FsrEasuH(c, pos, Const0, Const1, Const2, Const3);
-        imageStore(OutputTexture, ASU2(pos), AH4(c, 1));
+        frag_color = AH4(c, 1.0);
     #endif
 #endif
 #if USE_RCAS
     #ifndef YUZU_USE_FP16
         AF3 c;
         FsrRcasF(c.r, c.g, c.b, pos, Const0);
-        imageStore(OutputTexture, ASU2(pos), AF4(c, 1));
+        frag_color = AF4(c, 1.0);
     #else
         AH3 c;
         FsrRcasH(c.r, c.g, c.b, pos, Const0);
-        imageStore(OutputTexture, ASU2(pos), AH4(c, 1));
+        frag_color = AH4(c, 1.0);
     #endif
 #endif
 }
 
-layout(local_size_x=64) in;
 void main() {
-    // Do remapping of local xy in workgroup for a more PS-like swizzle pattern.
-    AU2 gxy = ARmp8x8(gl_LocalInvocationID.x) + AU2(gl_WorkGroupID.x << 4u, gl_WorkGroupID.y << 4u);
-    CurrFilter(gxy);
-    gxy.x += 8u;
-    CurrFilter(gxy);
-    gxy.y += 8u;
-    CurrFilter(gxy);
-    gxy.x -= 8u;
-    CurrFilter(gxy);
+#if USE_RCAS
+    CurrFilter(AU2(frag_texcoord * vec2(textureSize(InputTexture, 0))));
+#else
+    CurrFilter(AU2(gl_FragCoord.xy));
+#endif
 }
diff --git a/src/video_core/host_shaders/vulkan_fidelityfx_fsr.vert b/src/video_core/host_shaders/vulkan_fidelityfx_fsr.vert
new file mode 100644
index 000000000..6a87a7cac
--- /dev/null
+++ b/src/video_core/host_shaders/vulkan_fidelityfx_fsr.vert
@@ -0,0 +1,13 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#version 450
+
+layout(location = 0) out vec2 texcoord;
+
+void main() {
+    float x = float((gl_VertexIndex & 1) << 2);
+    float y = float((gl_VertexIndex & 2) << 1);
+    gl_Position = vec4(x - 1.0, y - 1.0, 0.0, 1.0);
+    texcoord = vec2(x, y) / 2.0;
+}
diff --git a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp16.comp b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp16.frag
index 00af13726..d369bef06 100644
--- a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp16.comp
+++ b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp16.frag
@@ -7,4 +7,4 @@
 #define YUZU_USE_FP16
 #define USE_EASU 1
 
-#include "fidelityfx_fsr.comp"
+#include "fidelityfx_fsr.frag"
diff --git a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp32.comp b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp32.frag
index 13d783fa8..6f25ef00f 100644
--- a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp32.comp
+++ b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_easu_fp32.frag
@@ -6,4 +6,4 @@
 
 #define USE_EASU 1
 
-#include "fidelityfx_fsr.comp"
+#include "fidelityfx_fsr.frag"
diff --git a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp16.comp b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp16.frag
index 331549d96..0c953a900 100644
--- a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp16.comp
+++ b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp16.frag
@@ -7,4 +7,4 @@
 #define YUZU_USE_FP16
 #define USE_RCAS 1
 
-#include "fidelityfx_fsr.comp"
+#include "fidelityfx_fsr.frag"
diff --git a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp32.comp b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp32.frag
index 013ca0014..02e9a27c6 100644
--- a/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp32.comp
+++ b/src/video_core/host_shaders/vulkan_fidelityfx_fsr_rcas_fp32.frag
@@ -6,4 +6,4 @@
 
 #define USE_RCAS 1
 
-#include "fidelityfx_fsr.comp"
+#include "fidelityfx_fsr.frag"